package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

//购物车
@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    //加入购物车
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据：{}",shoppingCart);

        //设置用户Id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        //查询当前菜品或者套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);


        if (dishId != null){
            //添加到购物车的菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        //查询当前菜品或者套餐是否存在
        //SQL : select * from shoping_cart user_id and dish_id /setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if (cartServiceOne != null){
            //如果已经存在，就在原来的基础上+1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number+1);
            shoppingCartService.updateById(cartServiceOne);

        }else {
            //如果不存在，就在原来的基础上+1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;

        }

        return R.success(cartServiceOne);
    }

    //查看购物车
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车：...");

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);

        return R.success(list);
    }

    //清空购物车
    @DeleteMapping("/clean")
    public R<String> clean(){
        //sql  delete from shopingCart where user_id = ?
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());

        shoppingCartService.remove(queryWrapper);

        return R.success("清空购物车成功");


    }

    //减少购物车
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据：{}",shoppingCart);

        //设置用户Id，指定当购物车是哪个用户的购物车
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        //查询当前菜品或者套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);


        if (dishId != null){
            //添加到购物车的菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        //查询当前菜品或者套餐是否存在
        //SQL : select * from shoping_cart user_id and dish_id /setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if (cartServiceOne != null){
            //如果已经存在，就在原来的基础上+1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number-1);
            shoppingCartService.updateById(cartServiceOne);

        }

        return R.success(cartServiceOne);

    }

}
